A 2,3-dihydro-3-hydroxyanthranilic acid zwitterion, obtained by transfer of a proton from the carboxylic acid group to the amino group of (2<stereo>S</stereo>,3<stereo>S</stereo>)-2,3-dihydro-3-hydrox
yanthranilic acid. ChEBICHEBI:60844, CHEBI:60849